Apparatus for boring shafts.



No. 698,165. Patented Apr. 22, I902. R. ABE.

. APPARATUS FOR BORING SHAFTS.

(Application filed Nov. 25, 1901.) (No Model.) 2 Sheets-Sheet 2; v

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RICHARD ABE, OF ANNEN, GERMANY, ASSIGNOR TO FRIED. KRUPP, or ESSEN, GERMANY.

APPARATUS FOR BORING SH'AFTS.

SPECIFICATION forming part of Letters Patent N 0. 698,165, dated April 22, 1902. 15

Application filed November 25, 1901. Serial No. 83,495. (No model.)

To all whom it may concern:

Be it known that I, RICHARD ABE, a citizen of Germany, residing at Annen, Westphalia, Germany, have invented certain new and useful Improvements in Apparatus for Boring Shafts, of which the following is a specifica tion.

This invention has reference to-improvements in apparatus for boring shafts, and has for its object to render such apparatus most durable and effective, and particularly to prevent breaking of the same by strains unevenly distributed on the striking-beam.

In the constructions heretofore employed it has quite frequently occurred that,during the operation of boring, where a stratum presenting an area of variable hardness to differ-.

ent parts of the trepans or striking-beam was encountered, the lateral vertical stays were bent by the lateral or turning movement caused by the unequal surfaces acted upon and also the connections with the shaft and footpiece were loosened.

The object of the present invention is to prevent such detrimental occurrences by forming the lateral vertical stays in triangular shape and so connected and placed as to transfer any and all lateral impact to the central and strongest part of the footpiece. At the same time the footpiece is strengthened by this same triangular construction of the stays, so that the danger of the wings of the footpiece breaking is practically avoided.

The nature of my invention will best be understood when described in connection with the accompanying drawings, in which Figure 1 represents a front elevation of an apparatus for boring shafts embodying my invention. Fig. 2 is a side elevation of the same. Fig. 3 is a side elevation of one of the triangular stays, drawn on an enlarged scale. Fig. 4: is a vertical section on the line 4 4, Fig. 3, looking from the right of said figure. Figs. 5 and 6 are horizontal sections on the lines 5 5 and 6 6, Fig. 3.

Similar letters of referencedesignate corresponding parts throughout the several views of the drawings.

In the present example I have shown a twowinged footpiece A, which is provided, as

usual, on its lower surface with trepans arranged in stepped form and has a U-shaped cross-section at its upper portion. In the central part of the gutter so formed the shaft B, strengthened by suitable ribs, is securely fastened by means of keys 0. The, connec- A shaft and are firmly connected to the same by screws or bolts. The cross;pieces E and F are received at their ends by two triangular stays G, which, similarly to the shaft B, lie between the cross-piecesand are connected with the latter by screws or bolts to form a rigid structure. Each stay G is made of one piece in the form of a hollow ribbed casting, the construction of which is clearly shown'in Figs. 3 to 6 and requires no further description. For the purpose of uniting the stays with the wings of the footpiece the former are provided each with a foot g, which exactly fits into the gutter next adjoining the shaft B in the footpiece A and is secured to the latter by means of screws or bolts. Besides this the stays, as well as the footpiece, are provided with horizontally-projecting and adjacent lugs H, which are held rigidly together by means of rings K, preferably shrunkthereon, so that the connection between the footpiece and the stays is absolutely rigid. The upper portion of the stays G is formed with broad flanges L, adapted to guide the boring apparatus in the shaft.

The previously-described arrangement of the boring apparatus has the advantage that in case the nature of the ground varies within the area of the trepans in view, for instance, by varying conditionsof stratum or by the presence of rock or unequalhardness of rock in the same stratum, which would throw an unequal strain upon one side of the wings of the boring-shaft, the strain is transmitted through the triangular stays to the central part ofthe footpiece and upon the cross-pieces, and therefore in view of the construction hereinbefore described a considerconnected with said shaft and with said stays, substantially as described.

In testimony whereof I have hereunto set What is claimed as new isi my hand in the presence of two subscribing 5 In an apparatus for boring shafts, the corn- I Witnesses.

bination of a shaft or beam, a footpiece rigl RICHARD ABE.

ably increased rigidity of the Whole boring apparatus is accomplised, so that a breaking or looseness of the single parts is not possible.

idly secured to said shaft and provided with trepans, side stays of triangular construction resting with their bases upon said footpiece IO and secured thereto, and cross-pieces rigidly XVitnesses:

HENRY HASPER, WOLDEMAR HAUPT. 

